I bought two of them about seven years ago. I was very pleased with them, and they served the function for which I needed them.
Unfortunately the key is very flimsy, and both keys are now broken, so I can't open the covers.
Sledgehammer time, methinks....
Later:-
My nephew has managed to open it.
There is apparently also a problem with the lockable designs in that the Health and Safety people considered them to be a possible safety hazard in that in the event of the "keyholder" going home to lunch and a fault developing in the "unit" being powered,there is no way of switching everthing off. Perhaps this is why it is no longer available.